Back-supported underwater propulsion device



FIG. 1 is a rear perspective view of a back-supported underwaterpropulsion device embodying my new design.

FIG. 2 is a side elevational view of the remote side as viewed in FIG.1.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a bottom plan view thereof.

The ornamental design for a back-supported underwater propulsion device,as shown and described.